806.03(b) Applicant May Add or Substitute a §44(d) Basis Only Within Six-Month Priority Period
An applicant may add or substitute a §44(d) basis only during the six-month priority period following the filing date of the foreign application. 37 C.F.R. §2.35(b)(5). See TMEP §806.02(f) regarding §44(d) combined with another basis.